Section 2 - Cylinder Head - Group 02 Cylinder Head - Rebuild (2-02) M11 Page 2-15 Visually inspect the valves for damage and the collet grooves for wear. Measure the outside diameter of the valve stem. Valve Stem O.D. mm in 9.580 MIN 0.3772 9.633 MAX 0.3793 If the valves are damaged or the stems are worn smaller than the minimum specified, the valves must be replaced. Place the valve on a flat surface and measure the head thickness (1) at the outside diameter. Valve Head Thickness (at O.D.) mm in 3.15 MIN 0.124 3.62 MAX 0.143 If the valve head is worn thinner than the minimum speci- fied, the valve(s) must be replaced. Visually inspect the valve guides for chips or cracks.
Measure the inside diameter of the valve guides in loca- tions 13mm [1/2 inch] from each end and at the center as shown. Used Valve Guide I.D. (Installed) mm in 9.670 MIN 0.3807 9.730 MAX 0.3831 Measure the valve guide installed height. Valve Guide Height (Installed) mm in 27.15 MIN 1.069 27.65 MAX 1.089 If damage is found or the valve guide(s) do not meet the limits specified, the valve guide(s) must be replaced. Refer to Cylinder Head Valve Guide - Replacement (2-03)